Electromagnetic Induction & Alternating Currents (NEET (NTA)-National Eligibility cum Entrance Test (Medical) Physics): Questions 79 - 82 of 124

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Question number: 79

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

MCQ▾

Question

Voltage (r. m. s) in the secondary coil of a transformer depends upon

(1) Voltage in the primary coil

(2) Ratio of number of turns in the two coils

(3) Frequency of the source

(4) Time-period of the source

Select the correct answers and mark it according to the following

Choices

Choice (4) Response

a.

1 and 2 are correct

b.

2 and 4 are correct

c.

1 and 3 are correct

d.

1,2 and 3 are correct

Question number: 80

» Electromagnetic Induction & Alternating Currents » Self and Mutual Inductance

MCQ▾

Question

Two inductors L 1 and L 2 are at a sufficient distance apart. Equivalent inductance when they are connected (i) in series (ii) in parallel are

Choices

Choice (4) Response

a.

b.

None

c.

d.

Question number: 81

» Electromagnetic Induction & Alternating Currents » Induced EMF and Current

Assertion-Reason▾

Assertion (Ꭺ)

The induced e. m. f. and current will be same in two identical loops of copper and aluminum, when rotated with same speed in the same magnetic field.

Reason (Ꭱ)

Induced e. m. f. is proportional to rate of change of magnetic field while induced current depends on resistance of wire.

Choices

Choice (4) Response

a.

Both Ꭺ and Ꭱ are true but Ꭱ is NOT the correct explanation of Ꭺ

b.

Ꭺ is true but Ꭱ is false

c.

Both Ꭺ and Ꭱ are true and Ꭱ is the correct explanation of Ꭺ

d.

Ꭺ is false but Ꭱ is true

Question number: 82

» Electromagnetic Induction & Alternating Currents » AC Generator and Transformer

MCQ▾

Question

A current of 5A is flowing at 220 V in the primary coil of a transformer. If the voltage produced in the secondary coil is 2200V and 50 % of power is lost, then the current in the secondary coil will be -

Choices

Choice (4) Response

a.

0.25A

b.

0.025A

c.

5A

d.

2.5A

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